169 



X/2 



Fig. 62. Fistulipo- 

 rina segregate. A por- 

 tion of the surface en- 

 larged, x 12 i after Hall 

 and Simpson). 



Distinguishing Characters.— T 1 1 1 1 1 . 1 ; 1 1 i icl- 

 late expansion of fronds; under surface 

 with thin epitheca; broadly oval or circu- 

 lar, irregularly disposed, cell apertures; 

 interspaces equal to or greaterthan diame- 

 ter of aperture; strong, distinct, smooth 

 peristome; comparatively large mesoporcs 

 in two or three series between apertures, 

 their margins lower than the peristomes; 

 low. rounded monticules, destitute of cell apertures in their 

 center. 



Found in the "'Hamilton group, at Eighteen Mile Creek, 

 Erie County, X. Y.," also "West Hamburg, Erie County, 

 N.Y." (Hall.) 



Fistuliporina micropora. (Hall.) (Fig. 63.) (Pal. 

 X. Y., Vol. VI., p. 220, Pis. LVIL, LIX.) 



Distinguishing Characters. — Thin, lamellate expansion of 

 frond, incrusting crinoid stems, etc.; vesiculose intercellular 

 tissue; broadly oval to nearly circular 

 irregularly disposed cell apertures, with 

 thin, smooth peristomes, ranging from con- 

 tact to a cell-diameter apart ; minute meso- 

 pores (about ten in space of 1 mm.) in 

 one, rarely two, series between apertures, 

 their margins equal in elevation to the peri- 

 stomes; general delicate appearance of 

 surface of frond. 



Found in the " Hamilton group, at Eight- 

 een Mile Creek, Erie County, N. Y." (Hall); and also in 

 the "Hamilton group, at West Hamburg, Erie County, 

 X. Y." (Explanation of plates.) 



Fistdliporina minuta. (Rominger.) (Fig. (54.) (Pal. 

 N. Y, Vol. VI., p. 222, PL LIX.) 



Distinguishing Characters.— Thin, lamellate expansion of 

 frond, which is free or incrusting; very thin, concentrically 

 wrinkled epitheca; irregularly disposed, comparatively large 

 vesicles occupying the intercellular space; oval to obscurely 



Fig. 63. Fistulipo- 

 rina micropora. Part 

 of surface enlarged, x 

 12 (after Hall and Simp- 

 son;. 



